Why is it significant that Christ's sufferings ended at the cross?

The significance of the finite nature of Christ's sufferings lies in the completeness of His sacrificial work on the cross, as noted in Hebrews 10:14, which states that by one offering, He has perfected forever those who are sanctified. This means that all that God's justice required for the salvation of His people was accomplished in Christ's suffering. His personal sufferings were unique and sufficient, and he will never endure them again. Therefore, any notion that believers must add to His suffering is both erroneous and diminishes the efficacy of His atonement. In essence, this understanding reaffirms the doctrine of salvation by grace alone, which is central to Reformed theology.